The new, bigger iPhone 6 will be out in the fall, according to
Reuters' sources.

Apple is also exploring a 5.5-inch iPhone, says Reuters, but it's
having trouble making those screens. As a result, Apple has
reportedly delayed production of the 5.5-inch
screen. We're not sure
what this means for the release time line of the 5.5-inch
iPhone.

Currently, Apple's iPhone comes in 4-inch sizes and 3.5-inch
sizes. The iPhone 5 and 5S has a 4-inch screen. The iPhone 4S has
a 3.5-inch screen. The
iPhone is small relative to Android-based phones. Samsung's
newest phone, for instance, has a 5.1-inch screen.